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Ultrasonic planar array sensor suitable for partial discharge detection of transformer

A partial discharge detection, planar array technology, applied in the direction of testing dielectric strength, etc., can solve the problems of inability to effectively measure the signal on site, poor anti-electromagnetic interference ability of the sensor, low sensitivity, etc., to achieve flexible beam control, good interference, etc. Rejection capability, effect of high signal gain

Active Publication Date: 2012-07-18
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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AI Technical Summary

Problems solved by technology

However, the current ultrasonic positioning method sensor is composed of a single array element, the sensitivity is very low, and the signal cannot be effectively detected on the spot; secondly, the anti-electromagnetic interference ability of the sensor is poor, and the ultrasonic signal is often affected by factors such as propagation path, frequency, and speed. distortion

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  • Ultrasonic planar array sensor suitable for partial discharge detection of transformer
  • Ultrasonic planar array sensor suitable for partial discharge detection of transformer

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Embodiment Construction

[0013] as attached figure 1 , 2 As shown, the present invention consists of 16 piezoelectric array elements 7 arranged in a silicone rubber filler 9 in a stainless steel casing 8, and the 16 piezoelectric array elements 7 are respectively connected through array element leads 4 and 16-core cables. 1 is connected, and a stainless steel protective film 6 is provided at the bottom of the stainless steel shell 8 .

[0014] In the present invention, a stainless steel cover 3 with a 16-core cable 1 is arranged on the upper end of the stainless steel housing 8 , and a compression nut 2 is arranged between the 16-core cable 1 and the stainless steel cover 3 .

[0015] The ultrasonic planar array sensor of the present invention is composed of 16 piezoelectric array elements 7 (piezoelectric ceramic array elements), and the piezoelectric array elements 7 are spaced at a distance of 5 mm. Each piezoelectric array element 7 includes four parts: a square piezoelectric wafer planar array,...

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Abstract

The invention relates to an ultrasonic planar array sensor suitable for the partial discharge detection of a transformer, which comprises 16 piezoelectric matrix elements arranged in silicone rubber filling in a stainless steel casing. The piezoelectric matrix elements are respectively connected with cables through matrix element leading wires; and a stainless steel protecting film is arranged atthe bottom of the piezoelectric matrix element which is below the stainless steel casing. The ultrasonic planar array sensor can be directly arranged on the outer wall of a transformer after being provided with magnetic media and is connected with a high-speed data synchronous acquisition device through 16 cables, thereby obtaining good partial discharge ultrasonic signals, forming an array modeland laying a good foundation for the realization of location algorithm based on array signal treatment.

Description

technical field [0001] The invention relates to an ultrasonic plane array sensor for detecting partial discharge of a transformer. Background technique [0002] With the development of the national economy, the requirements for the reliable operation of the power system are getting higher and higher, and the power transformer is the pivotal equipment in the power system, and its operation reliability is directly related to the safety and stability of the power system. Statistical analysis of actual faults shows that insulation faults are the main reason affecting the normal operation of transformers, and partial discharge is an important cause of insulation faults. [0003] At present, the development of condition maintenance of power equipment has become an inevitable trend, and accurate partial discharge location not only plays an important auxiliary role in the assessment of the degree of damage of partial discharge, but also provides scientific guidance for the condition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 刘宏亮李燕青刘海峰律方成谢庆胡涛武坤
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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